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ldionneldionne
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Implement missing compiler-rt functions in libc++
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2 files changed

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‎libcxx/src/CMakeLists.txt

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@@ -99,6 +99,7 @@ endif()
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if(WIN32)
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list(APPEND LIBCXX_SOURCES
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support/win32/compiler_rt_shims.cpp
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support/win32/locale_win32.cpp
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support/win32/support.cpp
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)

‎libcxx/src/support/win32/compiler_rt_shims.cpp

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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file reimplements builtins that are normally provided by compiler-rt, which is
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// not provided on Windows. This should go away once compiler-rt is shipped on Windows.
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//
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#include <cmath>
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extern "C" _LIBCPP_EXPORTED_FROM_ABI _Complex double __muldc3(double __a, double __b, double __c, double __d) {
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double __ac = __a * __c;
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double __bd = __b * __d;
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double __ad = __a * __d;
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double __bc = __b * __c;
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_Complex double z;
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if (std::isnan(__real__ z) && std::isnan(__imag__ z)) {
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int __recalc = 0;
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if (std::isinf(__a) || std::isinf(__b)) {
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__a = std::copysign(std::isinf(__a) ? 1 : 0, __a);
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__b = std::copysign(std::isinf(__b) ? 1 : 0, __b);
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if (std::isnan(__c))
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__c = std::copysign(0, __c);
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if (std::isnan(__d))
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__d = std::copysign(0, __d);
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__recalc = 1;
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}
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if (std::isinf(__c) || std::isinf(__d)) {
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__c = std::copysign(std::isinf(__c) ? 1 : 0, __c);
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__d = std::copysign(std::isinf(__d) ? 1 : 0, __d);
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if (std::isnan(__a))
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__a = std::copysign(0, __a);
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if (std::isnan(__b))
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__b = std::copysign(0, __b);
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__recalc = 1;
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}
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if (!__recalc && (std::isinf(__ac) || std::isinf(__bd) || std::isinf(__ad) || std::isinf(__bc))) {
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if (std::isnan(__a))
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__a = std::copysign(0, __a);
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if (std::isnan(__b))
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__b = std::copysign(0, __b);
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if (std::isnan(__c))
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__c = std::copysign(0, __c);
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if (std::isnan(__d))
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__d = std::copysign(0, __d);
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__recalc = 1;
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}
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if (__recalc) {
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__real__ z = HUGE_VAL * (__a * __c - __b * __d);
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__imag__ z = HUGE_VAL * (__a * __d + __b * __c);
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}
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}
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return z;
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}
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extern "C" _LIBCPP_EXPORTED_FROM_ABI _Complex float __mulsc3(float __a, float __b, float __c, float __d) {
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float __ac = __a * __c;
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float __bd = __b * __d;
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float __ad = __a * __d;
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float __bc = __b * __c;
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_Complex float z;
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__real__ z = __ac - __bd;
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__imag__ z = __ad + __bc;
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if (std::isnan(__real__ z) && std::isnan(__imag__ z)) {
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int __recalc = 0;
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if (std::isinf(__a) || std::isinf(__b)) {
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__a = std::copysignf(std::isinf(__a) ? 1 : 0, __a);
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__b = std::copysignf(std::isinf(__b) ? 1 : 0, __b);
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if (std::isnan(__c))
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__c = std::copysignf(0, __c);
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if (std::isnan(__d))
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__d = std::copysignf(0, __d);
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__recalc = 1;
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}
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if (std::isinf(__c) || std::isinf(__d)) {
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__c = std::copysignf(std::isinf(__c) ? 1 : 0, __c);
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__d = std::copysignf(std::isinf(__d) ? 1 : 0, __d);
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if (std::isnan(__a))
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__a = std::copysignf(0, __a);
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if (std::isnan(__b))
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__b = std::copysignf(0, __b);
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__recalc = 1;
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}
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if (!__recalc && (std::isinf(__ac) || std::isinf(__bd) || std::isinf(__ad) || std::isinf(__bc))) {
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if (std::isnan(__a))
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__a = std::copysignf(0, __a);
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if (std::isnan(__b))
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__b = std::copysignf(0, __b);
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if (std::isnan(__c))
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__c = std::copysignf(0, __c);
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if (std::isnan(__d))
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__d = std::copysignf(0, __d);
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__recalc = 1;
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}
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if (__recalc) {
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__real__ z = HUGE_VALF * (__a * __c - __b * __d);
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__imag__ z = HUGE_VALF * (__a * __d + __b * __c);
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}
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}
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return z;
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}
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extern "C" _LIBCPP_EXPORTED_FROM_ABI _Complex double __divdc3(double __a, double __b, double __c, double __d) {
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int __ilogbw = 0;
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double __logbw = std::logb(std::fmax(std::fabs(__c), std::fabs(__d)));
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if (std::isfinite(__logbw)) {
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__ilogbw = (int)__logbw;
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__c = std::scalbn(__c, -__ilogbw);
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__d = std::scalbn(__d, -__ilogbw);
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}
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double __denom = __c * __c + __d * __d;
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_Complex double z;
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__real__ z = std::scalbn((__a * __c + __b * __d) / __denom, -__ilogbw);
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__imag__ z = std::scalbn((__b * __c - __a * __d) / __denom, -__ilogbw);
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if (std::isnan(__real__ z) && std::isnan(__imag__ z)) {
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if ((__denom == 0.0) && (!std::isnan(__a) || !std::isnan(__b))) {
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__real__ z = std::copysign(HUGE_VAL, __c) * __a;
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__imag__ z = std::copysign(HUGE_VAL, __c) * __b;
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} else if ((std::isinf(__a) || std::isinf(__b)) && std::isfinite(__c) && std::isfinite(__d)) {
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__a = std::copysign(std::isinf(__a) ? 1.0 : 0.0, __a);
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__b = std::copysign(std::isinf(__b) ? 1.0 : 0.0, __b);
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__real__ z = HUGE_VAL * (__a * __c + __b * __d);
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__imag__ z = HUGE_VAL * (__b * __c - __a * __d);
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} else if (std::isinf(__logbw) && __logbw > 0.0 && std::isfinite(__a) && std::isfinite(__b)) {
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__c = std::copysign(std::isinf(__c) ? 1.0 : 0.0, __c);
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__d = std::copysign(std::isinf(__d) ? 1.0 : 0.0, __d);
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__real__ z = 0.0 * (__a * __c + __b * __d);
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__imag__ z = 0.0 * (__b * __c - __a * __d);
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}
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}
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return z;
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}
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extern "C" _LIBCPP_EXPORTED_FROM_ABI _Complex float __divsc3(float __a, float __b, float __c, float __d) {
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int __ilogbw = 0;
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float __logbw = std::logbf(__builtin_fmaxf(std::fabsf(__c), std::fabsf(__d)));
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if (std::isfinite(__logbw)) {
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__ilogbw = (int)__logbw;
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__c = std::scalbnf(__c, -__ilogbw);
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__d = std::scalbnf(__d, -__ilogbw);
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}
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float __denom = __c * __c + __d * __d;
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_Complex float z;
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__real__ z = std::scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw);
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__imag__ z = std::scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw);
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if (std::isnan(__real__ z) && std::isnan(__imag__ z)) {
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if ((__denom == 0) && (!std::isnan(__a) || !std::isnan(__b))) {
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__real__ z = std::copysignf(HUGE_VALF, __c) * __a;
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__imag__ z = std::copysignf(HUGE_VALF, __c) * __b;
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} else if ((std::isinf(__a) || std::isinf(__b)) && std::isfinite(__c) && std::isfinite(__d)) {
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__a = std::copysignf(std::isinf(__a) ? 1 : 0, __a);
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__b = std::copysignf(std::isinf(__b) ? 1 : 0, __b);
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__real__ z = HUGE_VALF * (__a * __c + __b * __d);
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__imag__ z = HUGE_VALF * (__b * __c - __a * __d);
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} else if (std::isinf(__logbw) && __logbw > 0 && std::isfinite(__a) && std::isfinite(__b)) {
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__c = std::copysignf(std::isinf(__c) ? 1 : 0, __c);
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__d = std::copysignf(std::isinf(__d) ? 1 : 0, __d);
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__real__ z = 0 * (__a * __c + __b * __d);
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__imag__ z = 0 * (__b * __c - __a * __d);
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}
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}
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return z;
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}

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